2.  The outer most layer of Earth  Made of Oxygen, silicon and aluminum

3.  Made of basalt  Younger, more dense, thinner

4.  Made of granite  Older, less dense, thicker

5.  Solid plastic-like rock  1800 miles thick  Convection currents supply most of Earth’s internal heat

6.  Made of liquid metal: iron and nickel  1400 miles thick  Creates Earth’s magnetic field

7.  Made of solid iron  800 miles  Slowly cooling and getting larger

9.  Man has explored the Earth to a depth of 7.6 miles

10.  Largest hole ever dug: scientific expedition  12,262 meters (7.6 miles)

11.  The temperature at this depth was 180°C (356°F), at which point the rock became more like a plastic than a solid, stopping further drilling

12.  Largest hand dug hole in the world  Largest volume of diamonds produced  600 meters (1,970 ft)